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SYN 50 => Little Labs Redeye 3D Phantom (DI/reamp) => UAD Apollo => Computer results in huge high pitch squeal!
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<blockquote data-quote="BTMagnus" data-source="post: 162319" data-attributes="member: 4567"><p>Hey Katash</p><p></p><p>Sorry for taking so very long to get back, and thanks a lot for taking the time to respond to my post, I truly appreciate it. </p><p></p><p>This all seems to be power related somehow. I'm no expert on electronics so don't take my word for it though <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p>I've spent many hours problem solving this by disconnecting everything extra in my chain - screens, monitors, pedals....everything...to end up with only the minimal necessary connected: the computer, UAD Apollo Quad interface, Redeye di/reamp, amp and iso box, nothing else. This is what I found: </p><p>1. If the minimal gear is connected as it should then I get the huge squeal. (Here I have the guitar connected to the active input on the DI that requires phantom power from the interface). Then I lift the ground on the DI/reamp box (as I should in a setup like this according to the manual) and the squeal disappears but the guitar signal sounds "electrified", broken. </p><p></p><p>2. When the ground is lifted so the squeal is gone but the guitar signal sounds broken I can actually get around this problem by lowering the amp volume quite much. Too much, like only 9 o'clock...which is not close to cranking the amp. </p><p></p><p>3. If I disconnect the computer from power it all works - I can crank the volume as much as I want without any problem and here the DI/reamp is connected to the interface and the interface to power. The computer and the interface is connected by firewire 800 that sends power...I don't know if this potentially could be the problem? </p><p>4. If I have the computer and interface connected to power at the same time it just doesn't work.</p><p></p><p>I've attached three audio files here as well. </p><p>File 1: This is a sound clip of when it actually works. </p><p>File 2: The squeal when computer, interface, di/reamp, amp, and iso box is connected together without the ground lifted on the di box. </p><p>File 3: The "broken" guitar sound when I've lifted the ground on the DI. This is the problem I can get around by lowering the volume on the amp drastically though. </p><p></p><p>Huge thanks again Katash and to everyone else in this thread. </p><p>// Magnus</p></blockquote><p></p>
[QUOTE="BTMagnus, post: 162319, member: 4567"] Hey Katash Sorry for taking so very long to get back, and thanks a lot for taking the time to respond to my post, I truly appreciate it. This all seems to be power related somehow. I'm no expert on electronics so don't take my word for it though :) I've spent many hours problem solving this by disconnecting everything extra in my chain - screens, monitors, pedals....everything...to end up with only the minimal necessary connected: the computer, UAD Apollo Quad interface, Redeye di/reamp, amp and iso box, nothing else. This is what I found: 1. If the minimal gear is connected as it should then I get the huge squeal. (Here I have the guitar connected to the active input on the DI that requires phantom power from the interface). Then I lift the ground on the DI/reamp box (as I should in a setup like this according to the manual) and the squeal disappears but the guitar signal sounds "electrified", broken. 2. When the ground is lifted so the squeal is gone but the guitar signal sounds broken I can actually get around this problem by lowering the amp volume quite much. Too much, like only 9 o'clock...which is not close to cranking the amp. 3. If I disconnect the computer from power it all works - I can crank the volume as much as I want without any problem and here the DI/reamp is connected to the interface and the interface to power. The computer and the interface is connected by firewire 800 that sends power...I don't know if this potentially could be the problem? 4. If I have the computer and interface connected to power at the same time it just doesn't work. I've attached three audio files here as well. File 1: This is a sound clip of when it actually works. File 2: The squeal when computer, interface, di/reamp, amp, and iso box is connected together without the ground lifted on the di box. File 3: The "broken" guitar sound when I've lifted the ground on the DI. This is the problem I can get around by lowering the volume on the amp drastically though. Huge thanks again Katash and to everyone else in this thread. // Magnus [/QUOTE]
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SYN 50 => Little Labs Redeye 3D Phantom (DI/reamp) => UAD Apollo => Computer results in huge high pitch squeal!
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